Emzone's Gravel Guard undercoating is a tough, flexible, textured black coating that protects against road abrasion and weathering. It's paintable and offers excellent adhesion to metals and plastics. Emzone's Gravel Guard undercoating offers superior protection against rust, corrosion, moisture and abrasion, and dries quickly to form a flexible, textured surface. It's professionally formulated to be tough, durable and long-lasting, and reduces road noise and vibration. Emzone's Gravel Guard undercoating is ideal for rocker panels, wheel arches and the underbody, and is silicone-free.